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Part ACSIR NET June 2025the-rise-is-the-sphere-volume-over-the-cylinder-cross-section-and-pi-cancels

The rise is the sphere volume over the cylinder cross section and pi cancels

A cylindrical container of radius 20 cm was filled with water up to 25 cm height. A solid spherical ball of radius 7 cm was then immersed in the water. What would be the approximate increase in water level in the container after the ball was fully immersed?

  1. A.1.14 cm✓ Correct
  2. B.2.28 cm
  3. C.5.50 cm
  4. D.7.00 cm

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests execution slip.

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50 are analysed free — try those first.

The trap it tests

Execution slip

The idea was right. The computation was not.

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